Hey guys, I haven't had time to read through all new posts yet. Gonna have to do some weekend reading.
A couple of things.
If you have cold boot issues when using high CPU SOC Voltage generating POST codes not directly related to DRAM (like 8 or 21, can be others too) you can try to set SIO Clock Skew to Disabled. Setting this could cause you to get stuck at 54/55, which then would be fixed by full power cycle or clearing CMOS.
Temps are what they are, Sense Mi skew = Disabled yields default AMD behavior. The temp getting stuck could be a couple of things, but it seems to be an isolated case?
Using DMM to measure voltage will be accurate only in idle. During load you will read higher than what the CPU is actually getting because of power plane droop being accounted for when the VRM outputs voltage.
The VRM uses on-die sense outputs to read accurate voltage at the "destination". It will thus output a higher voltage during load because there will be significant voltage drop across the CPU and ground power plane. To get a more accurate reading you need to measure at the MLCCs at the back of the CPU socket, and be sure to also get your ground point from there.